using System;
using System.ComponentModel;
using System.Net.Http.Headers;
using Jellyfin.Api.TypeConverters;
using Jellyfin.Server.Extensions;
using Jellyfin.Server.Implementations;
using Jellyfin.Server.Middleware;
using MediaBrowser.Common.Net;
using MediaBrowser.Controller;
using MediaBrowser.Controller.Configuration;
using MediaBrowser.Controller.Extensions;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.FileProviders;
using Microsoft.Extensions.Hosting;
using Prometheus;

namespace Jellyfin.Server
{
    /// <summary>
    /// Startup configuration for the Kestrel webhost.
    /// </summary>
    public class Startup
    {
        private readonly IServerConfigurationManager _serverConfigurationManager;
        private readonly IServerApplicationHost _serverApplicationHost;

        /// <summary>
        /// Initializes a new instance of the <see cref="Startup" /> class.
        /// </summary>
        /// <param name="serverConfigurationManager">The server configuration manager.</param>
        /// <param name="serverApplicationHost">The server application host.</param>
        public Startup(
            IServerConfigurationManager serverConfigurationManager,
            IServerApplicationHost serverApplicationHost)
        {
            _serverConfigurationManager = serverConfigurationManager;
            _serverApplicationHost = serverApplicationHost;
        }

        /// <summary>
        /// Configures the service collection for the webhost.
        /// </summary>
        /// <param name="services">The service collection.</param>
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddResponseCompression();
            services.AddHttpContextAccessor();
            services.AddHttpsRedirection(options =>
            {
                options.HttpsPort = _serverApplicationHost.HttpsPort;
            });
            services.AddJellyfinApi(_serverApplicationHost.GetApiPluginAssemblies());

            services.AddJellyfinApiSwagger();

            // configure custom legacy authentication
            services.AddCustomAuthentication();

            services.AddJellyfinApiAuthorization();

            var productHeader = new ProductInfoHeaderValue(
                _serverApplicationHost.Name.Replace(' ', '-'),
                _serverApplicationHost.ApplicationVersionString);
            services
                .AddHttpClient(NamedClient.Default, c =>
                {
                    c.DefaultRequestHeaders.UserAgent.Add(productHeader);
                })
                .ConfigurePrimaryHttpMessageHandler(x => new DefaultHttpClientHandler());

            services.AddHttpClient(NamedClient.MusicBrainz, c =>
                {
                    c.DefaultRequestHeaders.UserAgent.Add(productHeader);
                    c.DefaultRequestHeaders.UserAgent.Add(new ProductInfoHeaderValue($"({_serverApplicationHost.ApplicationUserAgentAddress})"));
                })
                .ConfigurePrimaryHttpMessageHandler(x => new DefaultHttpClientHandler());

            services.AddHealthChecks()
                .AddDbContextCheck<JellyfinDb>();
        }

        /// <summary>
        /// Configures the app builder for the webhost.
        /// </summary>
        /// <param name="app">The application builder.</param>
        /// <param name="env">The webhost environment.</param>
        /// <param name="appConfig">The application config.</param>
        public void Configure(
            IApplicationBuilder app,
            IWebHostEnvironment env,
            IConfiguration appConfig)
        {
            // Only add base url redirection if a base url is set.
            if (!string.IsNullOrEmpty(_serverConfigurationManager.Configuration.BaseUrl))
            {
                app.UseBaseUrlRedirection();
            }

            // Wrap rest of configuration so everything only listens on BaseUrl.
            app.Map(_serverConfigurationManager.Configuration.BaseUrl, mainApp =>
            {
                if (env.IsDevelopment())
                {
                    mainApp.UseDeveloperExceptionPage();
                }

                mainApp.UseMiddleware<ExceptionMiddleware>();

                mainApp.UseMiddleware<ResponseTimeMiddleware>();

                mainApp.UseWebSockets();

                mainApp.UseResponseCompression();

                mainApp.UseCors();

                if (_serverConfigurationManager.Configuration.RequireHttps
                    && _serverApplicationHost.ListenWithHttps)
                {
                    mainApp.UseHttpsRedirection();
                }

                mainApp.UseStaticFiles();
                if (appConfig.HostWebClient())
                {
                    mainApp.UseStaticFiles(new StaticFileOptions
                    {
                        FileProvider = new PhysicalFileProvider(_serverConfigurationManager.ApplicationPaths.WebPath),
                        RequestPath = "/web"
                    });
                }

                mainApp.UseAuthentication();
                mainApp.UseJellyfinApiSwagger(_serverConfigurationManager);
                mainApp.UseRouting();
                mainApp.UseAuthorization();

                mainApp.UseLanFiltering();
                mainApp.UseIpBasedAccessValidation();
                mainApp.UseWebSocketHandler();
                mainApp.UseServerStartupMessage();

                if (_serverConfigurationManager.Configuration.EnableMetrics)
                {
                    // Must be registered after any middleware that could change HTTP response codes or the data will be bad
                    mainApp.UseHttpMetrics();
                }

                mainApp.UseEndpoints(endpoints =>
                {
                    endpoints.MapControllers();
                    if (_serverConfigurationManager.Configuration.EnableMetrics)
                    {
                        endpoints.MapMetrics("/metrics");
                    }

                    endpoints.MapHealthChecks("/health");
                });
            });

            // Add type descriptor for legacy datetime parsing.
            TypeDescriptor.AddAttributes(typeof(DateTime?), new TypeConverterAttribute(typeof(DateTimeTypeConverter)));
        }
    }
}